Number | Name | Date | Kind |
---|---|---|---|
2504868 | Muller et al. | Apr 1950 | |
3019327 | Engel | Jan 1962 | |
3047713 | Liptak | Jul 1962 | |
3325626 | Sargent | Jun 1967 |
Number | Date | Country |
---|---|---|
659,015 | Nov 1951 | UK |
Entry |
---|
Taylor Lyman, ed., Metals Handbook, Vol. 6, 1971, pp. 298, 299, 308, 309. |